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Select the set of parents that can prod...

Select the set of parents that can produce child with blood group 'O'.
(i) `l^(A)i xx l^(A)i` , (ii) `l^(B)i xx l^(A)xxl^(A)`
(iii) `ii xx l^(A)i` , (iv) `l^(B)l^(B) xx l^(B)i`

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